Руководство по PHP
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pow

(PHP 3, PHP 4 )

pow -- Exponential expression

Description

number pow ( number base, number exp)

Returns base raised to the power of exp. If possible, this function will return an integer.

If the power cannot be computed, a warning will be issued, and pow() will return FALSE.

Пример 1. Some examples of pow()

<?php

var_dump( pow(2,8) ); // int(256)
echo pow(-1,20); // 1
echo pow(0, 0); // 1

echo pow(-1, 5.5); // error

?>

Внимание

In PHP 4.0.6 and earlier pow() always returned a float, and did not issue warnings.

See also exp() and sqrt().

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